Improvement in harvester-cutter sharpeners



UNITED STATES PATENT OFFICE.

ISAAC H. COLLER, OF POUGHKEEFSIE, NEW YORK.

IMPROVEMENT IN HARVESTER-CUTTER SHARPENEPFS.

specification forming part of Letters Patent No.'` 4 1.831, dated Marons, 1864.

To all whom t may concern:

Be it known that I, IsAAc H. CoLLER, of Poughkeepsie, in the county ofDutchessand State of New York, have invented a new and Improved Mode ofSharpening the Cutting- Blades of Reaping and lVIowing Machines and I dohereby declare that the following is a full and exact descriptionthereof, reference being had tothe accompanying drawings and letters ofreference marked thereon, forming a part of this my specification, inwhich?-l Figure 1 illustrates a cheap and portable machine operated by afoot-lever, by means of which my invention may be practically appliedfor the purpose of sharpening the. cutting-blades of reaping and mowinmachines. Fig. 2 is an end view illustrating my mode of sharpening saidblades.vv Fig. 3 is a side view, and Fig. 4 a top View.

The object of my invention is to 'provide a ready, chea-p, and suremeans whereby the contiguous cutting-edges of the cutting-blades ofreaping and mowing machines may simultaneously and with perfectuniformity be sharpened; and I would here state that I am aware thatsuch blades have had one of their cutting-edges sharpened withoutsimultaneously sharpening one of the edges of a contiguous blade, andthat this has been done on a grindstone or emery-wheel having a beveledgrinding-face; but when so done there has been a great defect inthecutting-edges of the cutter-blades, since by grinding a single edgeof such blades only at one time there has necessarily been nouniformity' in the cuttingangle of the entire series of blades used upona machine, whereas by my mode I simultaneously sharpen the contiguouscutting-edges of such blades and in such manner as to leave all of thecutting edges of a corresponding cutting-angle.

In the drawings, Figs. 1, 3, and 4 show a conical wheel, A, which has agrinding-surface of sufficient extent to simultaneously reduce to aperfectly-uniform cutting-edge the ccntiguous edges c d of the blades EE', represented in Figs. 2 and 4 as in the actof being sharpened uponsaid wheel. In other words, the conical surface of the wheel A, uponwhich the blades are to be ground, must be sufficient to act upon thecutter-blades throughout the whole extent of the line x w m2 at the sameinstant in the act of sharpening them. Thus the blades, when applied towheel A, as indicated in Figs. 2, 3, and 4, serve to steady each otherin the act of grinding, and, as the face of the cone-wheel A is uniform,a uniform cutting-angle will be imparted to the blades throughout theentire cutting-edges c d; and this desirable end may be obtainedthroughout the entire series of cutting-edges of the cutter-blades on areapingor mowing machine.

In Figs. 1 and 6, B indicates a grindingwheel of a differentconformation from that shown at A, having two beveled grindingfaces, ff,which terminate or meet at an apex, g, around the entire wheel, asindicated. These grinding-faces f f are of sufficient extent to grindthe whole of contiguous edges of adjoining cutter-blades and give them alike uniformity of cutting-angle, the same as when ground upon the wheelA. Either emery,co rundum, or sand may be applied to the wheels A B toform their grinding-surface, the wheels being made of wood and thegrinding-material applied thereto in the usual way of forming what isknown as emery-wheels.77

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

Beveling and sharpening the two contiguous edges of a mowing orharvesting cutterbar at one operation by straddling a conic or A-shapedwheel 'with the two contiguousA edges of adjoining blades of such bar,substantially as described. f

Witness my hand in matter of my application for a patent for improvedmode of sharpening the cutting-blades of harvesting-machines.

, -ISAAC lH. COLLER. Witnesses:

It. T. CAMPBELL, E. SGHAFER.

